毒物排泄的主要途径是()。
A.唾液
B.母乳
C.胃肠道
D.肾脏
E.汗液
参考答案:D
As a result of the earthquake, two-thirds of the buildings in the area _____. [ ]
A. need repairing
B. needs repairing
C. needs to be repaired
D. need to repair
空速大于210节襟翼自动收上后,如果空速又下降到限制值以下:().
A.襟翼再次放出
B.襟翼不会重新放出
C.缝翼会放出
D.WTB.作动