吸附-解吸气相色谱法测定空气中氯乙烯时,由于二硫化碳中的杂质出峰较迟,干扰氯乙烯的测定,所以可以用分析纯的二硫化碳作解吸液,不用提纯。
参考答案:对
用括号内所给动词的适当形式填空。
1. A committee _____ (consist) of nine members has been sent there to look into the matter.
2. Little Tom stood up, opened his note-book and _____ (pretend) that he had understand everything.
In fact, it was quite difficult.
3. We are going to visit an old temple _____ (date) back to 12th century.
4. I would rather you _____ (meet) her at the airport tomorrow morning.
5. I need one more stamp before my collection _____ (complete).
女性患者,79岁。因胃癌行胃大部切除术,术后出现低钠血症,纠正低钠过程中出现四肢瘫痪,不能言语,不能张口,但双眼可按指令做睁闭眼动作,双侧肌张力增高,腱反射活跃,双病理征阳性,该患的状态是()
A.嗜睡
B.去皮质综合征
C.无动性缄默
D.闭锁综合征
E.浅昏迷