Cost of pipeline is very different of underground conditions. Is it right? ()
A. Not
B. Yes
C. They can’t compare
D. Not discussion in the paragraph
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反密码子UGA所识别的密码子是:()
ACU
B. ACT
C. UCA
D. TCA
在()后重新计算最大允许关井套压。
A. 每次换班时
B. 改变钻井液密度
C. 每次换钻头后
D. 进入产层