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入户电缆保护管RC50的工程量是()m

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入户电缆YJV22- 4*16的工程量是()m

电缆头-16(mm2)的工程量是()个。

The doctors said that ( ) do little to keep the virus out.

A. surgical mask
B. cold-weather mask
C. gas mask
D. anti-pollution mask

lots of people purchased and mailed ( ) from overseas.

A.the anti-pollution masks
B. the gas masks
C. the surgical masks
D. the cold-weather masks