CRAC Class A (2025) — Questions 601–610
U0600. The unit of impedance is:
阻抗的单位是：
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阻抗 (impedance) is measured in ohms (欧/姆) (A), the same unit as resistance.
U0601. The unit of power is:
功率的单位是：
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功率 (power) is measured in watts (瓦/特) (A).
U0602. The unit of frequency is:
频率的单位是：
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频率 (frequency) is measured in hertz (赫/兹) (A). Henry is inductance, farad is capacitance, coulomb is charge.
U0603. In the legal system of units, the prefix k has the following mathematical meaning and verbal meaning respectively: ("x＾ m" means "x to the power m")
在法定计量单位中，词头k的数学意义和文字含义分别为：（"x ＾m"表示"x的m次方"）
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The prefix k (kilo, 千) means 10³ (A). Milli is 10⁻³, mega is 10⁶, micro is 10⁻⁶ (B/C/D are other prefixes).
U0604. In the legal system of units, the prefix m has the following mathematical meaning and verbal meaning respectively: ("x＾ m" means "x to the power m")
在法定计量单位中，词头m的数学意义和文字含义分别为： （"x＾m"表示"x的m次方"）
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The prefix m (milli, 毫) means 10⁻³ (A). Kilo is 10³, mega is 10⁶, micro is 10⁻⁶ (B/C/D are other prefixes).
U0605. In the system of legal units of measurement, what are the mathematical significance and textual meaning of the prefix M? ('x＾m' denotes 'x to the power of m'.)
在法定计量单位中，词头M的数学意义和文字含义分别为： （“x＾m”表示“x的m次方”）
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The SI prefix M (mega, 兆) represents a factor of 10^6. Option A correctly pairs the mathematical factor 10^6 with the Chinese character 兆. The other options describe micro (微, 10^-6), kilo (千, 10^3), and milli (毫, 10^-3), which are the prefixes μ, k, and m respectively.
U0606. In the system of legal units of measurement, what are the mathematical significance and textual meaning of the prefix μ? ('x＾m' denotes 'x to the power of m'.)
在法定计量单位中，词头μ的数学意义和文字含义分别为： （“x＾m”表示“x的m次方”）
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The prefix μ (micro, 微) represents 10^-6. Option A is correct. B is mega, C is milli, and D is kilo — all different prefixes.
U0607. In the system of legal units of measurement, what are the mathematical significance and textual meaning of the prefix G? ('x＾m' denotes 'x to the power of m'.)
在法定计量单位中，词头G的数学意义和文字含义分别为： （“x＾m”表示“x的m次方”）
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The prefix G (giga, 吉) represents 10^9. Option A is correct. B (mega, 10^6), C (tera, 10^12), and D (pico, 10^-12) are different prefixes.
U0608. In the system of legal units of measurement, what are the mathematical significance and textual meaning of the prefix n? ('x＾m' denotes 'x to the power of m'.)
在法定计量单位中，词头n的数学意义和文字含义分别为： （“x＾m”表示“x的m次方”）
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The prefix n (nano, 纳) represents 10^-9. Option A is correct. B is giga, C is tera, and D is pico — all different prefixes.
U0609. In the system of legal units of measurement, what are the mathematical significance and textual meaning of the prefix T? ('x＾m' denotes 'x to the power of m'.)
在法定计量单位中，词头T的数学意义和文字含义分别为： （“x＾m”表示“x的m次方”）
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The prefix T (tera, 太) represents 10^12. Option A is correct. B (pico, 10^-12), C (giga, 10^9), and D (nano, 10^-9) are all different prefixes.