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【判断题】
钢管属于黑色金属管,主要有焊接钢管和无缝钢管两种。 ( )A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】与牙髓炎相比,根尖周炎有其自身特点,说法错误的是:( )
A.
根尖区血运丰富
B.
急性期可以明确定位患牙
C.
炎症时组织的修复能力强
D.
可出现淋巴结肿大
E.
可以形成脓性病变
【单选题】The lecture __ when I arrived, So I found it hard to follow.
A.
started
B.
was starting
C.
would start
D.
had started
【简答题】试分别说明能量信号和功率信号的特性。
【单选题】I found the lecture hard to follow because it when I arrived.
A.
was started
B.
has started
C.
started
D.
had started
【单选题】The lecture when I arrived, so I found it hard to follow.
A.
started
B.
was starting
C.
would start
D.
had started
【简答题】I found the temptation to miss the class too hard to .
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