扁桃体上下均有粘膜相连，上端称为_________，下端称为_________。

极低出生体重儿是指初生1小时内

A．体重不足1kg

B．体重不足1.25kg

C．体重不足2kg

D．体重不足1.5kg

E．体重不足2.5kg

根据句意，用括号中所给词的正确形式填空。

1. Mr King learned Chinese as his _________ (two) language.

2. If you do your homework _________ (care), you will lose the exam again.

3. We should think about what we can do _________ (keep) animals and plants from becoming endangered.

4. —Did you go to Tom's birthday party? —No, I _________ (not invite)

5. We should do something to stop sandstorms from _________ (happen)

6. The man has known a lot of Chinese since he _________ (come) to China three years ago.

7. They _________ (not go) to the market until they finish their work.

8. The policeman said that he _________ (see) a Young Pioneer help an old woman cross the road

    the day before.

东风8B型内燃机车柴油机启动电路中，设置ZLS、FLC、RBC常闭触点有何作用？

为了考察甲状腺激素对代谢的影响，某人做了以下3组实验：①切除一白鼠的甲状腺，10天后与正常白鼠比较；②切除另一白鼠的甲状腺，5天后，将溶解于某种溶剂的甲状腺激素制剂给该白鼠连续注射5天，与正常白鼠比较；为了准确考察甲状腺激素对代谢的影响，第③组实验必须进行，下列最适合作为第③组实验的是（）

A.再切除一白鼠的甲状腺，5天后，将第②实验组所用的溶剂给该白鼠连续注射5天，与正常鼠比较

B.再切除一白鼠的甲状腺，5天后，将不同于第②实验组所用的溶剂给该白鼠连续注射5天，与正常鼠比较

C.取一白鼠，既不切除甲状腺也不注射甲状腺激素制剂，10天后与正常鼠比较

D.取一白鼠，将第②组实验所用的甲状腺激素制剂给该白鼠连续注射5天，然后切除甲状腺，5天后与正常鼠比较

管道内减阻层补伤原则是什么？