构成皂苷的成分主要是()
A.单萜
B.二萜
C.三萜
D.四萜
E.多萜
参考答案:C
Your sister has bad cold, and you must give her some medicine __ this afternoon.
A. an; / B. a; / C./;the
()操作不是P操作可完成的。
A.为进程分配处理机
B.使信号量的值变小
C.可用于进程的同步
D.使进程进入阻塞状态