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【多选题】
下列有关胶体叙述中不正确的是（ ）A.
胶体区别于其他分散系的根本原因是胶体有丁达尔效应
B.
分散系中分散质粒子直径由小到大的正确顺序是：溶液＜胶体＜浊液
C.
氯化铁溶液加入到冷水中可以制得氢氧化铁胶体
D.
胶体的分散质可以通过过滤从分散剂中分离出来
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【简答题】Telecommuting ( 远程办公 ) It’s 8:30, time for John to start work, so he turns on his radio. Then he eats breakfast. As he eats, he reads his e-mail and reviews his to-do list. Then he sits on the sofa an...
【单选题】阅读第四篇: Telecommuting ( 远程办公 ) It ’ s 8:30, time for John to start work. So he turns on his radio. Then he eats breakfast. As he eats, he reads his e-mail and reviews his to-do list. Then he sits on th...
A.
by telephone
B.
in his office
C.
away from home
D.
through the Internet
【简答题】Jane thinks that it is really for her to tell John about this but she has to do it.
【单选题】John thinks this is the right job because ___________.
A.
a. his parents told him it was
B.
b. the other ten jobs were not the right ones
C.
c. the other interviews were good
【单选题】以下关于精子获能的论述中正确的是
A.
精子获能过程中，精子质膜表面的唾液酸残基被酶移去，使质膜表面负电荷减少、膜结合的胆固醇被释放出来使精子质膜结构稳定性增加，流动性减弱。
B.
钙离子内流使腺苷酸环化酶的激活，引起 cAMP 增加，激活蛋白激酶 A ，使获能相关蛋白酪氨酸磷酸化从而诱发和维持精子活力，促进精子获能。
C.
精子获能后其运动形式由曲线运动变为直线前进。
D.
精子获能的部位是雄性生殖道。
【简答题】有 的 放 矢
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