Tom’s uncle must be an engineer, ___?
A.mustn’t he
B.can’t he
C.isn’t he
D.needn’t he
答案:C
Any decimal that has only a finite number of nonzero digits is a terminating decimal. For example, 24, 0.82, and 5.096 are three terminating decimals. If r and s are positive integers and the ratio is expressed as a decimal, is a terminating decimal ?()
(1)90<r<100
(2)s=4
A.条件(1)充分,但条件(2)不充分.
B.条件(2)充分,但条件(1)不充分.
C.条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分.
D.条件(1)充分,条件(2)也充分.
E.条件(1)和条件(2)单独都不充分,条件(1)和条件(2)联合起来也不充分.
老年人急性阑尾炎穿孔后不易局限的原因是()
A.腹肌萎缩
B.阑尾病理变化快
C.病情发展快
D.阑尾腔内压大
E.大网膜萎缩