I don't know ______ to answer this question.[ ]
A. how
B. what
C. where
D. which
答案:A
结核性腹膜炎常见并发症是
A.急性穿孔B.慢性穿孔C.便血D.腹腔脓肿E.肠梗阻
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(2)单独都不充分,条件(1)和条件(2)联合起来也不充分.
甲、乙两个人单独破译同一密码,则密码被破译的概率为0.8.() (1)甲破译的概率为0.6,乙破译的概率为0.5; (2)甲破译的概率为0.75,乙破译的概率为0.2.