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【判断题】
在锁主轴锁定销时,需要转动高速轴,可以把手握在刹车盘上来控制高速轴。( X )A.
正确
B.
错误
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举一反三
【单选题】下列说法正确的是
A.
一定条件反应：2CO(g) CO 2 (g)+C(s)可自发进行，则该反应的△H＞0
B.
向硫酸亚铁溶液中滴加硫氰化钾溶液产生血红色沉淀说明溶液已变质
C.
在反应KClO 3 +6HCl(浓)=KCl+3Cl 2 ↑+3H 2 O中，当生成1.5mol Cl 2 时，反应中转移的电子数为2.5N A
D.
相同物质的量浓度的下列溶液：①NH 4 HSO 4 ②NH 4 Cl③NH 3 ·H 2 O，水电离程度由大到小的顺序是：①>②>③
【简答题】It is ______ to compare the number of species of ant and butterfly.
【简答题】iMoD was developed from studies of butterfly wings.
【单选题】Which of the following statements concerning butterfly valves is correct?
A.
Special tools are required for lapping or grinding
B.
It is impossible to throttle flow with a butterfly valve
C.
To close the valve, it is only necessary to turn the handle a quarter of a turn
D.
The butterfly valve should never be used in a freshwater system
【简答题】--- How many __________ (butterfly) are there on the flowers? --- There is one __________ (butterfly).
【简答题】A Play: Four Butterflies(蝴蝶) Characters: Red Butterfly (RB), Green Butterfly (GB), Green Tree (GT), Rose (R), Grandpa Sun (GS) Look! There are four butterflies in the garden. One is red, one is yellow...
【单选题】下列酸碱滴定中反应中，其等量点pH值等于7.00的是（ ）
A.
NaOH 溶液滴定 HAc
B.
HCl 溶液滴定 NH 3 ·H 2 0
C.
HCl 溶液滴定 Na 2 CO 3
D.
NaOH 溶液滴定 HCl
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