【单选题】右旋糖酐20为生物大分子聚合物,具有分子量大小不均一的特点,控制其分子量与分子量分布是质量控制的关键,《中国药典》采用色谱法检查,所用检测器为 ( )。
【简答题】情景对话。 M: Hi, Sandra! How l. _______ you? W: I'm 2. _______,thanks. And you? M: I'm fine, 3. _______ What's the 4. _______today? W: It's August l0th, Bill. M: 5. _______ is your birthday? W: My birthda...
【单选题】The main purpose of this passage is to______.
A.
convince people that global warming is a real threat
B.
criticize some countries for refusing to cut down emissions harmful to the ozone layer
C.
analyze the problem of global warming
D.
argue against making deep cuts in emissions
【判断题】it is going to rain.
【简答题】根据奥氏体化程度不同,钢的淬火可分为 , 两类 。
【单选题】Global warming is a real problem.
【简答题】A.It is going to rain. B.The woman feels cold. C.There is a cold wind. D.They don't have umbrellas.