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【多选题】
三极管的工作状态有()
A.
截止状态
B.
放大状态
C.
饱和状态
D.
缩小状态
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皮皮学刷刷变学霸
举一反三
【单选题】w无节幼|和无节幼体||的区别是
A.
身体分节不同
B.
附肢刚毛数及尾棘数的不同
C.
附肢数不同
D.
附肢内部结构不同
【多选题】完整的入库交接手续应包括()。
A.
登账
B.
接收货物
C.
接收文件
D.
签署单证
【多选题】完整的入库交接手续应包括( )。
A.
登账
B.
接受物品
C.
接受文件
D.
签署单证
【单选题】In 1831 when Smith was finally recognized by the Geological Society of London as the 'father of English geology,' it was not only for his maps but also for something even more important. Ever since pe...
A.
the rocks from different strata closely resembled each other
B.
he was often unable to find fossils in the younger rock strata
C.
their similarity to each other made it difficult for him to distinguish one rock type from another
D.
the type of rock between two consistent strata was always the same
【多选题】零件表面是由()、()、()、()、球面、圆环面、螺旋面等组成。
A.
平面
B.
直线成形表面
C.
圆柱面
D.
圆锥面
【单选题】The unit of geological time is _______ ?
A.
million years
B.
thousand years
C.
hundred years
D.
ten years
【单选题】______ late in the evening that the geological team pitched camp.
A.
It's not until
B.
It was until
C.
It is till
D.
It was not until
【简答题】某小组同学对废干电池筒内的黑色固体(内含有MnO 2 、NH 4 Cl、ZnCl 2 等)进行了如下图所示的实验: (1)操作②的名称是 ,该操作中玻璃棒的作用是 。 (2)操作③灼烧滤渣黑色固体时,会产生一种使澄清石灰水变浑浊的气体,由此推测滤渣中除含有MnO 2 外,还存在的物质是 。 (3)操作④的试管中产生的气体使带火星的木条复燃,则该气体为 。 (4)已知在氯化锌溶液中逐滴滴入稀氨水,先...
【单选题】(The age of) a geological sample can (be estimated) from the ratio of radioactive to nonradioactive carbon (present) in the object (is examined).
A.
The age of
B.
be estimated
C.
present
D.
is examined
【多选题】完整的入库交接手续应包括( )。
A.
签署单证
B.
接受物品
C.
接受文件
D.
登账
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