如果操作时加拔键器拉曲柄键也拉不动,可用吊车或手拉葫芦调节角度直至将键拉出键槽。
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An alarm device inserted between the deaerating tank and the expansion tank can notify the on-watching crew that ()
A. the expansion tank is lack of water
B. the expansion tank is over flowing
C. there is something wrong with the cooling system
D. there is something wrong with the engine
某日,正在营业的服装城着火,火势越来越大,扑灭困难,商场应立即拨打()火警电话。
A. 120
B. 119
C. 110
船舶决定安全航速时()考虑能见度、通航密度、船舶操纵性能、风浪、流及航道情况和周围环境等主要因素,使用雷达的船舶,还()考虑雷达设备的特性、效率和局限性。
A. 应当;可能
B. 应当;应当
C. 可以;应当
D. 可以;可以
()年在美国硅谷第一片微处理器诞生。
A. 1969
B. 1970
C. 1971
D. 1972