离心泵的小修周期是3-4个月,大修周期是()。
A.8-10个月
B.5-7个月
C.12-18个月
参考答案:C
— Can you tell me something about _________ science.
— OK. _ Nobel Prize in Chemistry is usually awarded to Americans.
A.the; The
B./; The
C.a; /
D.the; /
《音乐的体制》