I would like some _____________. [ ]
A. hot dogs
B. hot dog
C. the hot dog
答案:A
已知a+2b+3c=20,a+3b+5c=31,则a+b+c的值为 [ ]
A、6
B、7
C、8
D、9
.凝结水过冷度增大1℃煤耗率约增加()。
A.0.1~0.15%
B.0.15~0.18%
C.0.2~0.1%
D.0.1~0.05%