水泵的电机温度应()。
A.≤50°
B.≤65°
C.≤75°
D.≤85°
参考答案:C
下列物质中属于多糖的是()
A.寡糖
B.糖原
C.麦芽糖
D.葡萄糖
E.蔗糖
There _______ a wonderful film on TV last night. Did you see it? [ ]
A. had
B. has
C. were
D. was