有500千克小麦,烘干后还有428千克.计算这种小麦的烘干率和含水率.
428500×100%=85.6%,
1-85.6%=14.4%.
答:烘干率为85.6%,含水率是14.4%.
我国电力系统的额定频率是()HZ。
A、50
B、100
C、314
D、500
40. I could have offered you some help last weekend, but I ______ with my work at that time.
A.would be occupied
B.was occupying
C.had been occupied
D.was occupied