1MB的存储量相当于________。
A.一百万个字节
B.2的10次方个字节
C.2的20次方个字节
D.1000KB
参考答案:C
The traffic department has taken effective measures ________ the car speed in the town and
________ the traffic accidents.[ ]
A. limiting; cut off
B. to limit; cut up
C. limiting; cut out
D. to limit; cut down
具有酸碱两性的是()
A.氨基酸
B.蛋白质
C.多糖
D.鞣质
E.有机酸