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【单选题】
一元羧酸的结构通式是A.
(Ar)R-OH
B.
(Ar)R-CHO
C.
(Ar)R-COOH
D.
(Ar)R-CO-OR(Ar)
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举一反三
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【单选题】What discovery have US scientists made?
A.
The discovery of gravitational waves.
B.
The discovery of two black holes.
C.
The discovery of what happened after the universe began.
D.
The discovery of how the universe expanded.
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【多选题】下面属于护筒的作用的是?
A.
可以保护孔口不致因钻头起落而破坏，提高桩孔内的泥浆水头
B.
可以在护筒上边放置设备
C.
护筒顶面还可作为钻孔深度、钢筋笼下放深度、混凝土面位置
D.
导管埋深的测量基准
【简答题】The best title for this passage is [A] The Discovery of Magellan's Strait. [B] The Discovery of the Philippines. [C] The Most erous Expedition in Navigation. [D] The First Expedition to Asia.
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