【单选题】实船在确定每个固定气体监测点时,除应满足规定的保护面积和间距外,还应考虑( )。 1拟载运货品的蒸气密度;2舱内各种构件的布置;3拟载运货品的蒸气温度;4空气进出口位置所形成的死角位置
【单选题】When __________ the Kings __________ to China?
【单选题】单相桥式整流电路中,构成整流桥需 4 个二极管,若有 1 个二极管阳极与阴极接反了,则输出( )。
【单选题】—I _____ the book to the library. —When ______ you _____ it? [ ]
A.
has returned; did; return
B.
have returned; have; returned
D.
returned; have; returned
【单选题】—When did he leave for China? —______ a sunny morning. [ ]