钻井泵上水管连接要用卡箍卡紧，也可以用钢丝绳捆绑。
参考答案：错
Never before seen anybody who can play tennis as well as Robert.
A．had she
B．she had
C．has she
D．she has
某工程招标项目估算价为5000万元，按照《招标投标法实施条例》规定，其投标保证金不得超过（）万元。
A.20
B.50
C.80
D.100
