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【简答题】
做生物实验需要配制1000g 0.9%的生理盐水，请回答： （1）你的配制步骤为 _________ 、 _________ 、 _________ ． （2）需要NaCl _________ g，水 _________ g．
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【单选题】Everyone has periods in their lives ______ everything seems very hard.
A.
when
B.
where
C.
which
D.
That
【简答题】LTE的协议栈根据用途分为____协议和____协议,其中____协议负责用户数据传输;____协议负责系统信令传输。
【单选题】Everyone has periods in their lives__________everything seems so hard.
A.
when
B.
where
C.
which
D.
that
【单选题】Everyone has periods in their lives ______ everything seems very hard.
A.
when
B.
where
C.
which
D.
that
【单选题】In my opinion, everyone has periods in their lives _______ everything seems very hard.
A.
when
B.
where
C.
which
D.
that
【简答题】Everyone has periods in their lives _______ everything seems so hard.
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