在曲柄摇杆机构中，如果一个连架杆为曲柄，另一个连架杆为摇杆，这个机构为曲柄摇杆机构。
参考答案：对
新生儿易致呼吸道和消化道感染是因为下述物质不能通过胎盘
A．IgA
B．IgG
C．IgM
D．SIgA
E．补体
用括号内所给词的适当形式填空。
1. She was _____ (embarrass) when they asked her age.
2. My mother cried because of the sad _____ (end) of the movie.
3. We feel _____ (exhaust) after an hour's walk.
4. My cousin will get _____ (marry) next moth.
5. His arguments sound _____ (convince). Everyone believes him.
