支配斜方肌的是()。
A.C1~3
B.C4
C.C5
D.C6
E.C7
参考答案:B
We still don’t know what _________ while we were away from home.
A.had happened
B.was happened
C.has happened
D.happened
苯贮槽碱洗只能洗去苯中的己内酰胺,SO2只能依靠碱洗除去。