The FIRST thing to do to ensure that a refrigeration unit will not start while undergoing repairs, is to （）. ["secure and tag the electrical circuit","place a crow bar in the flywheel of the unit","inform all persons in the area not to start the unit","make a log book entry"]
In case of any loss or misfortune it is the duty of（）to take such measures as may be reasonable for the purpose of averting or minimizing a loss which would be recoverable under this insurance. ["the Assured and their servants and agents","the Assurer and his servants and agents","the Charterer and his servants and agents","the Operator and his servants and agent"]
LAN Switch工作在TCP/IP模型中的哪一层（）。
《八十天环游地球》中福格未在旅途中使用过（）。 ["大象","雪橇","轮船","自行车"]
风管制作安装的工程量如何计算？
实施“文明交通行动”的意义是什么？
