万用表测量交流电压时,其读数是()。
A.最大值
B.有效值
C.平均值
D.最小值
参考答案:B
从所给的四个选项中,选择最合适的一个填入问号处,使之呈现一定的规律性()
A.A
B.B
C.C
D.D
Can the positive integer p be expressed as the product of two integers, each of which is greater than 1 ?() (1)31<p<37 (2)p is odd
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.