有毒性的安神药是（） A.酸枣仁 B.远志 C.磁石 D.朱砂 E.琥珀

某设备安装工程的网络计划如图8-3所示，计算工期为44天。根据技术方案，确定A、D、I三项工作使用一台机械顺序施工。

问题：

1．如果按A—D—I顺序组织施工，则：

(1)网络计划图应如何改变

(2)计算工期是多少天

(3)机械在现场的使用和闲置时间各是多少天

2．如果按D—A—I顺序组织施工，则：

(1)网络计划图应如何改变

(2)计算工期是多少天

(3)机械在现场的使用和闲置时间各是多少天

3．比较以上两个方案的优缺点。

4．监理工程师如批准按D—A—I顺序施工的方案，施工中由于业主原因，工作B时间延长5天，承包商提出要求延长5天工期。你认为工期延长几天合理为什么监理工程师签发机械闲置(赔偿)时间几天合理为什么

Research on animal intelligence always makes me wonder just how smart humans are. (51) the fruit-fly experiments described in Carl Zimmer’s piece in the Science Times on Tuesday. Fruit flies who were taught to be smarter than the average fruit fly (52) to live shorter lives. This suggests that (53) bulbs burn longer, that there is an advantage in not being too terrifically bright.

Intelligence, it (54) , is a high-priced option. It takes more upkeep, burns more fuel and is slow off the starting line because it depends on learning—a (55) process—instead of instinct. Plenty of other species are able to learn, and one of the things they’ve apparently learned is when to (56) .

Is there an adaptive value to (57) intelligence That’s the question behind this new research. I like it. Instead of casting a wistful glance (58) at all the species we’ve left in the dust I.Q.-wise, it implicitly asks what the real (59) of our own intelligence might be. This is on the mind of every animal I’ve ever met.

Research on animal intelligence also makes me wonder what experiments animals would (60) on humans if they had the chance.

58().

A.upward 

B.forward 

C.afterward 

D.backward

表达式x．operator+(y．operator++(0) )还可以写成【 】。

工信部《太阳能光伏产业“十二五”发展规划》确定的十二五太阳能光伏产业发展目标有（）。

A.经济目标

B.技术目标

C.创新目标

D.光伏发电成本目标

T91对应的国际钢号为（）。

A、10Cr9Mo1

B、10Cr9Mo1V

C、10Cr9Mo1VNb

D、10Cr9Mo1Si