依据《中华人民共和国水法》,围湖造地是被()的行为。
A、限制
B、适度允许
C、鼓励
D、禁止
参考答案:D
It is clear that a computer works ______ faster than an abacus .
A.a lot
B.a lot of
C.little
D.very
医用超短波电流的频率为
A.13.56MHz
B.24.50MHz
C.27.12MHz
D.40.68MHz
E.433.92MHz