That boy spent much time _____ computer games.
A play B playing C played D to play
答案:B
It was _______ useful information that the company _______ much money on it.[ ]
A. so a, paid
B. such, spent
C. so an, paid
D. such a, spent
用金膜富集-冷原子吸收分光光度法测定环境空气中汞含量时,采样后,富集管两端需用橡皮帽密封。