在涂抹甲油的过程中,右手的小指要抵靠在左手的适当位置,以增加右手的()。
A、力度
B、强度
C、稳定性
D、完美性
参考答案:C
They urged that the library _________ open during the vacation.
A.must be kept
B.is kept
C.would be kept
D.be kept
试述植物体中同化物装入和卸出筛管的机理。