不定项选择

We should establish all of the assumptions from one data source.

A．错误
B．正确

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单项选择题

6.1) We are also in a position to insure the shipment_________ any additional risks if you desire so.

A、against
B、at
C、with
D、in

单项选择题

The doping in the wider bandgap semiconductor is usually denoted with a capital letter N or P. and that in the narrower bandgap semiconductor with lower case n or p.
A、正确
B、错误