便携式报警器使用前,首先要检查好电源电压是否充足。
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食品生产企业当食品安全相关的法律法规标准更新时,应及时开展培训。
A. 正确
B. 错误
非提速铁路货车TFDS“各梁及车体”部分的检查范围和预报标准标准是如何规定的?
Which of the following statements about transmitting distress messages by radiotelephone is INCORRECT?()
A. If no answer is received on the designated distress frequencies,repeat the distress call on any frequency available
B. Channel 16 (156.8) may be used for distress messages
C. It is advisable to follow a distress message on 2182 kHz by two dashes of 10 to 15 seconds duration
Distress messages should first be transmitted on 2182 kHz
可修复废品是指经过修理可以使用,而且所花费的修复费用在经济上合算的废品。
A. 正确
B. 错误