铸铁焊补时,热焊法的预热温度为( )℃。A.100~150 B.400 C.250

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问题:

铸铁焊补时,热焊法的预热温度为( )℃。

A.100~150

B.400

C.250~300

D.600~700

考点:焊工焊工高级技师焊工高级技师
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课税对象决定税收的课税范围,是区别征税与不征税的主要界限,也是区别不同税种的主要标志。( )

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质量相等,温度不同的两个铁块,温度________的具有的内能大;温度相等,质量不等两个铁块,质量 ________的内能大。

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瓦楞子、牡蛎、海螵蛸与四环素联用,能()

A.引发肾功能衰竭

B.形成络合物

C.产生永久性结合物

D.引发永久性耳聋

E.引发药源性肝病

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何谓中药的性能?

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Visitors to Britain may find the best place to sample local culture is in a traditional pub. But these friendly hostelries can be minefields of potential gaffes for the uninitiated.
An anthropologist and a team of researchers have (1) some of the arcane rituals of British pubs—starting with the (2) of getting a drink. Most pubs have no waiters—you (3) to go to the bar to buy drinks. A group of Italian youths (4) for 45 minutes before they realized they would have to (5) for their own. This may sound inconvenient, but there is a (6) purpose.
Pub culture is designed to (7) sociability in a society known for its reserve. Standing at the (8) for service allows you to chat with others (9) to be served. The bar counter is possibly the only (10) in the British Isles in which friendly conversation with (11) is considered entirely appropriate and really quite normal (12) . "If you haven’t been to a pub, you (13) been to Britain." This tip can be found in a (14) , Passport to the Pub: The Tourists’ Guide to Pub Etiquette, a (15) code of conduct for those wanting to sample "a central part of (16) life and culture". The trouble is that if you do not (17) the local rules, the experience may fall flat. For (18) , if you are in a big group, it is best if only one (19) two people go to buy the drinks. Nothing irritates the (20) customers and bar staff more than a gang of strangers blocking all access to the bar while they chat and dither about what to order.

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