起动由（）、（）和（）三部分组成。

下列化学用语或模型表示正确的是

A．Cl^－离子的结构示意图：

B．CH₄分子的比例模型：

C．CCl₄的电子式：

D．氮气的结构式：N=N

受监察的压力容器的压力条件是最大工作压力（）。

A.≥0.1MPa

B.<0.1MPa

C.≥1.0MPa

D.无压力

Schools and parents in Shenzhen City have been asked to take better care of children’s eyesight as 45 percent of them, were found to be shortsighted. Too much reading, poor lighting and too much TV are blamed. Of the city’s high school graduates who applied to attend college this summer, two-thirds had to have their choices limited because of poor eyesight, Shenzhen Special Zone Daily said.

小题1:This piece of news was reported by____ .

A．People’s Daily

B．Shenzhen Special Zone Daily

C．school in Shenzhen City

D．parents in Shenzhen City小题2:The purpose of this passage is to _____ .

A．criticize children who are shortsighted

B．blame parents and schools for children’s being shortsighted

C．ask the high school graduates to pay attention to their eyesight

D．draw people’s special attention to eye hygiene(卫生)小题3:Only____ of the children in Shenzhen City have good eyesight.

A．55 percent

B．less than half

C．45 percent

D．two—thirds小题4:Because of being shortsighted many school graduates_____ .

A．weren’t allowed to enter college

B．couldn’t graduate from high school

C．couldn’t choose to study what they liked best

D．lost their limited time

对桩基进行抗震验算时，其单桩竖向承载力计算应符合下述（）极限状态计算表达式。（）

A.轴心竖向力作用下N≤R偏心竖向力作用下

B.轴心竖向力作用下N≤R偏心竖向力作用下Nmax≤1.2R

C.轴心竖向力作用下γ0N≤1.15R偏心竖向力作用下≤1.3R

D.轴心竖向力作用下轴心竖向力作用下

子宫黏膜下肌瘤临床表现不恰当的是（）。

A.经量过多、经期延长

B.坏死感染可出现 * * 不规则流血

C.容易发生早期流产

D.可致不孕

E.肌瘤小时无临床症状