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【单选题】
假设雨水竖直地落入沿着无摩擦的水平直轨道运动的敞篷,随着雨水在聚集,车的速度将( )。A.
增大
B.
减小
C.
不变
D.
不确定
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A.
Right.
B.
Wrong.
C.
Doesn't say.
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A.
JDK是Java开发工具包
B.
JRE 是Java开发工具包
C.
JDK 是Java运行时环境
D.
JRE 是Java运行时环境
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A.
prep.在…里面 n.内部
B.
vt.使接触;与…联系
C.
n.仪器;工具;乐器
D.
n.保存,保护;守恒
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A.
枸橼酸盐培养基中不含有蛋白胨和牛肉膏
B.
常用的指示剂是 BTB
C.
标本的接种量不宜过多
D.
培养基变兰为利用试验阳性
E.
有细菌生长，但培养基仍为绿色，为利用试验阴性
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