单项选择题

By doing the "tank test", the engineers can find out______.

A．the amount of air in the plane
B．the strength of the plane structure
C．the pressure inside and outside the plane
D．the power of the airplane engines

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热门试题

单项选择题

What might be the most suitable title for the text

A．Two Important Tests on Airplanes
B．The Importance of Flying Safely
C．The Danger of Testing Airplanes
D．How Airplanes Are Made and Tested

单项选择题

Dr. Luskin advises us not to wait for an apology after being hurt because______.

A．we are not patient enough
B．we'd feel worse accepting others' apology
C．people seldom want to apologize
D．people don't mean it when they apologize