【单选题】一对心曲柄滑块机构,若以曲柄为机架时,则将演化成( )机构
【单选题】一对心曲柄滑块机构,若以滑块为机架时,则将演化成( )机构
【单选题】我国海岸电台对国际船舶窄带直接印字电报自动操作按()数收取岸台费。
【单选题】The thing that many western people might feel uncomfortable is that _______.
A.
there are too many buffet restaurants in China
B.
Chinese eat too much than they really need
C.
Chinese use chopsticks to pick up food repeatedly
D.
So many Chinese are too fat
【单选题】( ) 21. There’s _________ umbrella behind the door.