润湿剂的HLB值
A. 3～8
B. 7～9
C. 8～16
D. 13～18
E. 0～20
使用机车救援动车组时，应进行制动试验，制动主管压力采用()kPa。
A. 650
B. 600
C. 500
What is the main idea of me news item？
A. US concern over the forthcoming peace talks.
B. Peace efforts by the Palestinian Authority.
C. Recommendations by the Mitchell Commission.
D. Bomb attacks aimed at Israeli civilians.
What does Sally fail to recollect about the book to help students pronunciation？
A. Color of the cover.
B. Accompanying tapes.
C. Title and author.
D. Unimportant details.
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