磁路定律可由()来证明其正确。
A.描述磁场性质的磁通连续性原理;
B.安培环路定律;
C.描述磁砀性质的磁通连续性原理和安培环路定律;
D.磁路欧姆定律。
参考答案:C
实行税收的优惠政策一定程度违反了税收的固定性。[ ]
— Speak ______, please, because I can't hear a word from the back.
— Well, it's ______ enough. [ ]
A. loudly, loudly
B. louder, loud
C. loud, louder
D. loud, too loud