慢性左心功能不全常见的症状和体征不包括（）
A.第三心音奔马律
B.疲倦、乏力
C.夜间阵发性呼吸困难
D.咳粉红色泡沫痰
E.第一心音增强
参考答案：E
用词、短语或句子补全对话。
(Liu Ming and Wang Hai are making plans for their holidays.)
A: Hi, Wang Hai. 1.______
B: I am going to sports camp in Shandong.
A: Who are you going with?
B: My friends.
A: 2.______B: On the 10th of January.
A: 3 ______are you staying there?
B: For about two weeks. What's your 4. ______ ?
A: I am visiting Beijing with my family. We're leaving this Friday.
B: 5.______ Have a good time.
当一个事务执行期间所使用的数据，不能被第二个事务再使用，直到第一个事务结束为止。这个性质称为事务的
A．串行性
B．隔离性
C．永久性
D．原子性
