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【单选题】
端面锪钻中,其端面刀齿为切削刀,前端导柱用来( ),以保证端面与中心线的垂直度。
A.
定位
B.
导向定心
C.
切削端面
D.
保证与工件接触
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参考解析：
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皮皮学刷刷变学霸
举一反三
【单选题】双务合同是指双方当事人互相享有权利、承担义务的合同，下列属于双务合同的是（）。
A.
借用合同
B.
租赁合同
C.
保证合同
D.
赠与合同
查看完整题目与答案
【单选题】She will never forget the day ______ she joined the party.
A.
when
B.
which
C.
that
D.
where
查看完整题目与答案
【判断题】本实验中,标准溶液及待测液必须用移液管移取,其他试剂也尽可能用移液管移取。
A.
正确
B.
错误
查看完整题目与答案
【单选题】企业每两个改变一次折旧的计算方法和存货的计价方法违背了()
A.
见
B.
教材
C.
选项
D.
呵
查看完整题目与答案
【单选题】According to Rowena Baker, one problem which Smithson's faced when she joined was that
A.
the number of people using the store was falling slowly.
B.
its competitors offered a more specialised range of products.
C.
the store's prices were set at the wrong level.
D.
customers were unhappy with the service provided.
查看完整题目与答案
【单选题】According to Bowena Baker， one problem which Smithson‘s faced when she joined was that_______ 查看材料
A.
the number of people using the store was falling slowly
B.
its competitors offered a more specialized range of products
C.
the store's prices were set at the wrong level
D.
customers were unhappy with the service provided
查看完整题目与答案
【单选题】碘化物造影须做过敏试验,应在何时进行( )
A.
造影前1~2h内
B.
造影前6~12h
C.
造影前12~24h
D.
造影前24~48h
E.
造影前48~72h
查看完整题目与答案
【单选题】用减压蒸馏来提纯化合物时,下列说法不正确的是 ( )
A.
减压蒸馏主要用于受热易分解或氧化、高沸点等物质的提纯。
B.
减压蒸馏的沸点不可预测，我们只能接收不同沸点的产物，然后根据量来判断产物。
C.
进行减压蒸馏时，可以不需要装温度计在蒸馏头上。
D.
减压蒸馏的沸点不是唯一的，全班同学可以不一样。
查看完整题目与答案
【单选题】According to Rowena Baker, one problem which Smithson's faced when she joined was that
A.
the number of people using the store was falling slowl
B.
its competitors offered a more specialised range of product
C.
the store's prices were set at the wrong leve
D.
customers were unhappy with the service provide
查看完整题目与答案
【单选题】碘化物造影须做过敏试验,应在何时进行()
A.
造影前1~2h内
B.
造影前6~12h2
C.
造影前12~24h
D.
造影前24~48h
E.
造影前48~72h分钟
查看完整题目与答案
相关题目：
【单选题】双务合同是指双方当事人互相享有权利、承担义务的合同，下列属于双务合同的是（）。
A.
借用合同
B.
租赁合同
C.
保证合同
D.
赠与合同
查看完整题目与答案
【单选题】She will never forget the day ______ she joined the party.
A.
when
B.
which
C.
that
D.
where
查看完整题目与答案
【判断题】本实验中,标准溶液及待测液必须用移液管移取,其他试剂也尽可能用移液管移取。
A.
正确
B.
错误
查看完整题目与答案
【单选题】企业每两个改变一次折旧的计算方法和存货的计价方法违背了()
A.
见
B.
教材
C.
选项
D.
呵
查看完整题目与答案
【单选题】According to Rowena Baker, one problem which Smithson's faced when she joined was that
A.
the number of people using the store was falling slowly.
B.
its competitors offered a more specialised range of products.
C.
the store's prices were set at the wrong level.
D.
customers were unhappy with the service provided.
查看完整题目与答案
【单选题】According to Bowena Baker， one problem which Smithson‘s faced when she joined was that_______ 查看材料
A.
the number of people using the store was falling slowly
B.
its competitors offered a more specialized range of products
C.
the store's prices were set at the wrong level
D.
customers were unhappy with the service provided
查看完整题目与答案
【单选题】碘化物造影须做过敏试验,应在何时进行( )
A.
造影前1~2h内
B.
造影前6~12h
C.
造影前12~24h
D.
造影前24~48h
E.
造影前48~72h
查看完整题目与答案
【单选题】用减压蒸馏来提纯化合物时,下列说法不正确的是 ( )
A.
减压蒸馏主要用于受热易分解或氧化、高沸点等物质的提纯。
B.
减压蒸馏的沸点不可预测，我们只能接收不同沸点的产物，然后根据量来判断产物。
C.
进行减压蒸馏时，可以不需要装温度计在蒸馏头上。
D.
减压蒸馏的沸点不是唯一的，全班同学可以不一样。
查看完整题目与答案
【单选题】According to Rowena Baker, one problem which Smithson's faced when she joined was that
A.
the number of people using the store was falling slowl
B.
its competitors offered a more specialised range of product
C.
the store's prices were set at the wrong leve
D.
customers were unhappy with the service provide
查看完整题目与答案
【单选题】碘化物造影须做过敏试验,应在何时进行()
A.
造影前1~2h内
B.
造影前6~12h2
C.
造影前12~24h
D.
造影前24~48h
E.
造影前48~72h分钟
查看完整题目与答案