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It was ______ that we went for a picnic in the country.A. such nice a dayB. such nice d
A、A. such nice a day
B、B. such nice day
C、C. so nice a day
D、D. so nice day
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第4题
已知某脂质药物的投料量W总，被包封于脂质体的药量W包和未包入脂质体的药量W游，试计算此药的重量包封率Qw（）。
A、Qw%=W包/W游
B、Qw%=W游/W包*100%
C、Qw%=W包/W总*100%
D、Qw%（W总-W包）/W游*100%
E、Qw%=（W总-W包）/W包*100%
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