（4分）请用化学用语填空： 磷元素；2个铅原子；3个氢氧根离子；酒精。

如图所示是描述地球上不同位置的人释放手中石块的四个示意图，图中的虚线表示石块下落的路径，则对石块下落路径的描述最接近实际的示意图是（　　）

A．

B．

C．

D．

消瘦病史采集要点

Two middle-aged sisters have been diagnosed with Huntington's disease. The children of these clients want to know what their chances are of developing this genetic disorder. The nurse's best response would be.

A．"Only women become symptomatic. "

B．"This disorder is an autosomal dominant disorder, so each child has a 50% chance of inheriting it. "

C．"This disorder is an autosomal recessive disorder, so each child has a 25% chance of inheriting it. "

D．"Women are symptomatic and men are carriers of this disorder. "

短信在柜台签约默认的缴费方式：（）。

A.包年

B.包月

C.包年加包月

D.无默认方式

SSS300系统译码器保密码偏制有（）种。

A.2

B.3

C.4

D.5