如图所示,水从水箱流经直径为d=2.5cm的管道流入大气中。当出口流速为 10m/s时,质量流量Qg=()。
A. 490kg/s
B. 4.9kg/s
C. 0.0049kg/s
D. 0.00049kg/s
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听力原文:M: This is a one-way street. Didn't you see the sign?
W: Sorry. I didn't.
Q: What do we learn from the conversation?
(7)
A. The woman is driving too fast.
B. The woman is driving at a slow speed.
C. The woman has broken a traffic rule.
D. The woman has parked her car in a wrong place.
阿米巴病最严重的肠内并发症为
A. 肠阿米巴肉芽肿
B. 结肠狭窄,阿米巴瘤形成
C. 肠出血
D. 肠穿孔
E. 阑尾炎
听力原文:M: Is that 62225666 ? I'm trying to reach the guest house.
W: I'm sorry. This is a private resident.
What number does the woman want?
A. 62255666.
B. 66225666.
C. 62225666.