下面这些物质是同学们在家庭生活中经常用到的，其中属于纯净物的是 [ ] A. 矿

用所给词的适当形式填空

小题1:Doctors often tell us         (drink) more water every day.

小题2:It’s easy for us          (have) a good lifestyle.

小题3:        you        (watch) TV last night?

小题4:How many       (west) countries do you have?

小题5:I              (visit) my grandpa next month.

小题6:Tom with his sister          (have) lunch at school every day.

小题7:He plans          (spend) this weekend with his friends.

小题8:          (smoke) is bad for your health.

小题9:Tom forgot          (do) his homework last night.

小题10:Lily had to look after his mum because of her          ( ill).

小题11:I decided              (play) tennis with the children.

小题12:He’s very        (excite) and he really needs a         (relax) vacation.

小题13:Children like outdoor(户外的)          (active).

小题14:Can he finish        (read) the book in about a week?

小题15:He         (leave) the first week in June and          (stay) until August.

小题16:My mother wants me          (exercise) often.

小题17:He thought about          (go) to Italy.

小题18:Peng Liyuan is a famous           (sing) in China.

小题19:My grandma looks very young because she            (play) sports every day.

小题20:I’m not           (feel) well, I have a fever.

择期手术病人术前准备中以下哪项不妥（）

A.成人禁食6～8小时

B.婴儿术前2～3小时可喂少量糖水

C.老年人应做肺功能评估

D.急性上呼吸道感染者，手术应推迟至治愈两周后

E.成人Hb应不低于80g/L

在项目主要参与方共同编制并执行的多级进度计划体系中，第一级计划——项目进度总控制计划的编制步骤有______。

A．编制各专业工程进度计划

B．由业主或管理咨询单位编制项目进度总控制计划的初始版本

C．细化各专业工程进度计划

D．编制项目进度总控制计划的调改版本

E．编制项目进度总控制计划的正式版本

300MW汽轮机在停机后，使用电动盘车装置以（）r/min的转速转动汽轮机转子。

对于框架眼镜的缺点，描述错误的是（）

A.笨重不便

B.镜片起雾

C.不耐用

D.视野小

E.光学缺陷影响视觉质量