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【简答题】
在1离心泵、2往复泵、3旋涡泵、4齿轮泵中,能用调节 出口阀开度的方法来调节流量的有() A. ①② B. ①③ C. ① D. ②④
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】磺脲类口服降糖药的主要作用机制是
A.
促进胰岛素释放
B.
促进肌肉等外周组织摄取葡萄糖
C.
延迟碳水化合物的吸收，降低餐后高血糖
D.
提高细胞对胰岛素作用的敏感性
E.
减轻胰岛素抵抗
【单选题】needle and thread ________ to her just now, but she could not sew the button on.
A.
gave
B.
was given
C.
was giving
D.
were given
【简答题】A needle and
thread______ given her, but she couldn't sew the button on.A. were B. was C. has D. have
【简答题】surgical needle and thread
【单选题】The needle and thread ____precious for my grandmother who is good at sewing.
A.
is
B.
are
C.
isn't
D.
aren't
【单选题】—My shirt is torn. —______me a needle and thread, and I’ll fix it for you.
A.
If you bring
B.
If you had brought
C.
Bringing
D.
Bring
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