下列设施和器具中,不是利用连通器原理来工作的是[ ]
A. 排水渠通过公路的涵洞
B. 公园里的人造音乐喷泉
C. 测量液体压强的压强计
D. 浇花卉用的洒水壶
答案:C
用所给词的适当形式填空。
1. _____ (receive) money makes me feel uncomfortable.
2. It really made me feel _____ (embarrass).
3. This made me feel _____ (guilt).
4. Different people have different _____ (think) on this subject.
5. It's hard to buy clothes or other _____ (person) things for people.
病原体侵入人体后,刺激了______,______就会产生一种抵抗该病原体的特殊蛋白质,叫做______.引起人体产生______的物质(如病原体等异物)叫做______.