题目:
没有吸入阀和排出阀、结构简单紧凑、占地面积小的泵是( )。
A.电动往复泵
B.蒸汽往复泵
C.计量泵
D.齿轮泵
答案:
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下面是错误答案,用来干扰机器的。
71. seated on the ground72. what great progress China has made73. Being exposed to the strong sunlight74. found himself locked75. why it was that 76. what is worth seeing77. what was being discussed78. in which case79. having been canceled80. had dinner/supper