每位船员每月至少参加1次弃船演习和1次消防演习,若有25%以上船员未参加本船上月演习,应在离港后()内举行该两项演习。
A.12h
B.18h
C.24h
D.30h
参考答案:C
设方程x2-px-q=0的解集为A,方程x2+qx-p=0的解集为B,若A∩B=1,则p+q=().
A.2
B.0
C.1
D.-1
用所给词的适当形式填空。
1. What about going _____ ( swim) this afternoon?
2. Gina often _____ (look after) the little girl af ter school.
3. Look! The boy _____ ( read) under the tree.
4. He gave me some _____ ( advice).
5. I _____ (real) need some help.