船舶保安检查的内容说法正确的是（）
A.限制区域
B.应急计划及内容
C.保安薄弱点评估
D.A+B
参考答案：D
The band was very successful in the seventies, most of ________ members were in their twenties.
A．its
B．whose
C．whom
D．which
下列化合物的HNMR谱图中出现一组单峰．一组二重峰．一组三重峰的化合物是（）。
A.CH3CH2CH2COCH3
B.（CH3）2CHCOCH3
C.（CH3）3CCHO
D.CH3CH2COCH2CH3
