PAD的缺点有()
A、多目标时画面很乱
B、如何使SHM避开PAD,避碰规则由驾驶员负责
C、在进出港或狭水道时,用车、用舵频繁,不能用PAD
D、A+B+C
参考答案:D
They were surrounded by the enemy, but they________at last from the village. [ ]
A. managed escaping
B. tried to escape
C. managed to escape
D. tried escaping
图一是在30%的蔗糖溶液中正发生质壁分离的细胞亚显微结构示意图,图二是该细胞发生的某种生理过程示意图。请回答下列问题:
图一示意的质壁分离现象与细胞膜和()这两个膜结构密切相关;①处充满了()。