【单选题】
当发生跨步电压达到40V以上时，人体将有触电的危险。( ) ___
A. 正确
B. 错误
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答案
A
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汽车通过铁路平交道时，其装载高度不得超过4.2米和触动道口限界门的活动横板或吊链。严禁在装载高度超过 ( ) 米以上的货物上坐人。 ___
A. 0.5
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机动车载运危险化学品，应当经 （ ）批准后，按指定的时间、路线、速度行驶，悬挂警示标志并采取必要的安全措施。 ___
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货运机动车超过核定载质量，但没有超过核定载质量30%的，处（ ）罚款 ___
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When do the students start learning Chinese? ___
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Which of the following statements is Not True? ___
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