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【判断题】
叶片泵属于叶轮式泵。A.
正确
B.
错误
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】下列哪项可维持神经和肌肉的兴奋性，是构成骨骼和牙齿的主要成分：( ) A．钙 B．镁 C．锌 D．磷 E．铁
【单选题】We specialize in supplying small stores in rural areas,and this assured sales outlet enables us () of fairly large quantities.
A.
of disposing
B.
dispose
C.
to dispose
D.
disposing
【单选题】听力原文：Q: When will those specialists arrive from Wisconsin? (A) Yes, we specialize in homepage customization. (B) For about two weeks. (C) I haven't received their itinerary. (8)
A.
B.
C.
【单选题】We specialize ( ) the exportation of Chinese light industrial products.
A.
of
B.
with
C.
in
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