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【单选题】
X6132型万能铣床调试前，检查电源时，首先接通试车电源，用( )检查三相电压是否正常A.
电流表
B.
万用表
C.
兆欧表
D.
单臂电桥
拍照语音搜题，微信中搜索"皮皮学"使用
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】关于青蒿素和双氢青蒿素(结构如图)的下列说法，错误的是______。 A．青蒿素的分子式为C15H22O5 B．由青蒿素制备双氢青蒿素的反应属还原反应 C．青蒿素分子中含有过氧链和酯基、醚键 D．双氢青蒿素分子中有2个六元环和2个七元环
A.
正确
B.
正确
C.
正确
D.
三个六袁环和一个七元环
【单选题】The service in this restaurant is very poor there are not enough waiters to wait ______ customers.
A.
on
B.
for
C.
with
D.
to
【单选题】Most of the waiters are____in their work because the owner of the restaurant does not pay them on time.
A.
rack
B.
tack
C.
slack
D.
stack
【单选题】In this restaurant, there are not enough waiters to wait ______ customers.
A.
on
B.
for
C.
with
D.
to
【简答题】已通过()的订阅号，可自动获得自定义菜单
【简答题】[A]visitors[B]owners[C]waiters[D]guests
【单选题】Most of the waiters are ______ in their work because the owner of the restaurant does not pay them on tinge.
A.
rack
B.
tack
C.
slack
D.
stack
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