问题
单项选择题
为了率定圆管内径，在管内通过运动黏滞系数为0.013cm2/s的水，实测流量为35cm3/s，长15m管段上的水头损失为2cm水柱，此圆管的内径为（）。
A.20.1mm
B.19.4mm
C.26.3mm
D.17.3mm
答案
参考答案：B
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为了率定圆管内径，在管内通过运动黏滞系数为0.013cm2/s的水，实测流量为35cm3/s，长15m管段上的水头损失为2cm水柱，此圆管的内径为（）。
A.20.1mm
B.19.4mm
C.26.3mm
D.17.3mm
参考答案：B
| 阅读理解。 | |
| |
| 1. What makes the girl think the sweater is her favourite? | |
[ ] | |
| A. The girl's grandma made it. B. The girl got it at the age of three. C. The yarn is the color of bluebells. D. The cat Queen uses it for the kittens. | |
| 2. Why does the girl give the sweater away? | |
[ ] |
| A. The girl is tired of the sweater. B. The girl wants her grandma to make a new sweater. C. The girl likes her new jacket better than the sweater. D. The girl thinks the sweater is too small. |
| 3. What will most likely happen to the green jacket? |
[ ] |
| A. The jacket will become too small. C. The girl will sell the jacket. B. The kittens will use the jacket for a bed. D. The jacket will become the girl's favorite. |
| 4. Read this line from the poem: "My favorite sweater grew too small." What does this line mean? |
[ ] |
| A. The girl likes small sweaters. B. The girl's sweater became smaller than it once was. C. The girl's grandma made a small sweater. D. The girl became too big for the sweater. |
| 5. Read this line from the poem: Queen just had kittens out in the shed. The word "shed" in this line probably means ______. |
[ ] |
| A. the girl's sweater B. the girl's jacket C. the cats' house D. the cats' sweater |