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【单选题】
关于抽吸药液的方法,错误的一项是A.
自密闭瓶内抽药，针头与瓶塞应垂直
B.
排气时食指针栓
C.
吸药时针头斜面应向上，空筒容量刻度朝上
D.
折断安瓿应用拉力掰开，而不用压力
E.
药瓶内应先注等量空气后再抽吸
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【单选题】They had _______ wonderful train ride to Chengdu before they went on to _______ Mount Emei by bus.
A.
a; the
B.
/; the
C.
a; /
D.
the; a
【简答题】电火花成形加工中,影响加工速度的因素有哪些?
【简答题】电火花成形加工中,影响加工速度的因素有哪些?
【单选题】John waited at the bus-stop for nearly half an hour the bus finally arrived .
A.
when
B.
as
C.
before
D.
while
【单选题】The price of the bus ticket is much ____ than before.
A.
cheap
B.
cheapest
C.
cheaper
D.
the cheapest
【单选题】——＿＿＿＿you ＿＿＿＿ the editor at the airport? —— No, he ＿＿＿＿ away before my arrival.
A.
Have...met； has driven
B.
Had...met； was driven
C.
Did...meet； had been driven
D.
Have...met； had driven
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