喷涂聚氨酯时，可多遍完成，每次喷涂厚度应控制在（）mm之内 A.20 B.15 C.

Sense of humor is just one of the many things shared by Alfred and Anthony Melillo, 64-year-old twin brothers from East Haven who made history in February 2012. On Christmas Eve, 2002, Anthony had a heart transplant(移植)from a 21-year-old donor(捐赠者). Two days before Valentine’s Day in 2012, Alfred received a 19-year-old heart, marking the first time on record that twin adults each received heart transplants.

“I’m 15 minutes older than him. But now I’m younger because of my heart and I’m not going to respect him, ”Alfred said with a smile, pointing to his brother while talking to a roomful of reporters, who laughed frequently at their jokes.

While the twins knew that genetics(遗传学)might have played a role in their condition, they recognized that their bad eating habits might have also contributed to their heart problems. “We’d put half a pound of butter on a steak. I overdid it on all the food that tasted good, so I guess I deserved what I got for not dieting properly. ”

The discussion moved to Anthony’s recovery. In the five years since his heart transplant, he had been on an exercise program where he regularly rode a bicycle for five miles, swam each day, and walked a couple of miles. He was still on medication(药物治疗)but not nearly as much as Alfred, who was just in the early stage of his recovery.

Alfred said his goal, of course, was to feel even better than his brother. “But”, he added, “I love my brother very much. We’re very close and I’m sure we’ll do just fine. ”

小题1:What is this passage about? (within 10 words)

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小题2:What did Alfred and Anthony have in common in character according to Paragraph 1? (within 7 words)

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小题3:Why did Alfred say he was younger than Anthony? (within 8 words)

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小题4:What were the most probable two causes of the brothers’heart problem? (within 6 words)

小题5:What did Anthony do for five years after his operation? (within 7 words)

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在绘制网络图中，A的紧后工序是B和C，B的紧后工序是D和E，C的紧后工序是F和G，则C的紧前工序是（）。

A.B

B.D

C.A

D.E

甲铁块的质量是乙铁块质量的2倍，它们吸收了相等的热量，则甲、乙两铁块的比热之比是            ，甲、乙两铁块升高的温度之比是                 。

10个月健康男婴，生长发育良好。下列哪点不是其生长发育所需热量的特点

A．每增加1g体重约需热量20.92kJ(5kcal)
B．其生长发育的热量占总需要量的25%～39%
C．婴儿期用于生长发育的能量每天每公斤体重约需125.52～167.36kJ(30～40 kcal)
D．当热量供应不足时，可使生长发育速度缓慢或停止
E．因小儿处于不断生长发育中，故各年龄阶段生长发育所需能量是一致的

关于前向式离心通风机的性能描述错误的是（）

A.叶片的出口安装角度＞90°

B.动压大于静压

C.通风机效率低

D.在同样风量下，其理论压力比后向式小