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【单选题】
移动通信是沟通移动用户与固定点用户之间或移动用户之间的通信方式,下面各项中,____不是移动通信的明显特点。A.
移动性
B.
频带利用率高，设备性能好
C.
系统和网络结构复杂
D.
不受噪声干扰
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举一反三
【简答题】当钻头在地下钻井,会产生大量的 , 。堆积在 附近。如果不及时清理出来,钻头是无法工作的。所以需要 能实时把泥土、岩屑等带回到地面。 2 、钻井液的主要作用之一是平衡地层中的 ,防止 等井下复杂情况。
【简答题】Itwas not clear the man hadn’treported the accident sooner.A. that B. how C. when D. why
【简答题】治疗手术后腹气胀和尿潴留最好选用 。
【单选题】It was not until she got home _______ Jenniferr
A.
9. It was not until she got home _______ Jenniferrealized she had lost her keys. ( 全国 3) A. when
B.
that
C.
where
D.
before
【单选题】It was reported another person was infected with bird flu.
A.
what
B.
which
C.
when
D.
that
【单选题】It was________ bad weather ________ we had to stay at home．A． so that B． such a so
A.
9．It was________ bad weather ________ we had to stay at home． A． so that
B.
such a so ．
C.
s，o a that
D.
such that
【简答题】听对话，完成第l-3小题。 1. How was the girl's school trip? A. It was borin9. B. It was great. C. It was terrible .2. Were there any lions in the zoo? A. N0,there weren't. B. Yes,there were. C. We don't know. 3....
【简答题】简述钻井液的主要作用？
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