单项选择题
An instrument useful in predicting fog is the（）.
A.sling psychrometer B.microbarograph C.anemometer D.aneroid barometer
单项选择题 An advantage of nylon rope over manila rope is that nylon rope（）.
单项选择题 All the expenses are（）the ship’s account.
单项选择题 All the copper bars are（）different sizes.
