单项选择题
A.sling psychrometer B.microbarograph C.anemometer D.aneroid barometer
A.can hold a load even when a considerable number of the yarns have been abraded B.can be stored on deck，exposed to sunlight C.can be used in conjunction with wire or spring-lay rope D.gives audible warning of overstress whereas manila does not
A.of B.for C.to D.at