油水井大修的主要内容包括：井下事故处理，复杂落物打捞，套管修理，侧钻等。
参考答案：对
More bison were killed．The bison population is thought ______ from 60 million to just a few hundred between 1850 and 1910.
A．to have fallen
B．having fallen
C．to fall
D．falling
患者盛氏，一身悉肿，尤以身半以下为重，腹胀喘满，二便不利，脉沉实有力。治宜选用（）
A.十枣汤
B.实脾散
C.五皮散
D.真武汤
E.泻白散
