()
A.A
B.B
C.C
D.D
参考答案:B
解析:
每个图形中都只有一个黑色图形,黑色方块和黑色三角形交替出现,由此确定答案为B。
—I hear that Huang Gang made an English speech contest last week.
---____________and ___________.
A.So did he,so did you.
B.So he did, so you did.
C.So did he,so you did.
D.So he did ,so did you.
制冷剂管道阻力会( )制冷压缩机的排气压力。
A.降低 B.升高 C.不变 D.升高或降低