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【单选题】
对低速气流,由伯努利方程可以得出A.
流管内气流速度增加，空气静压也增加
B.
流管截面积减小，空气静压增加
C.
流管内气流速度增加,空气静压减小
D.
不能确定
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【简答题】The most appropriate title for this text is. ［A］Differences between Two Webs ［B］The Humanization of Computer Software ［C］A New Solution to World Problems ［D］The Creator and His Next Creation
【单选题】Wonder Webs Spider webs are more than homes, and they are ingenious traps. And the world's best web spinner may be the Goldern Orb Weaver spider. The female Orb Weaver spins a web of fibers thin enoug...
A.
tough
B.
soft
C.
large
D.
smooth
【多选题】关于干胶法制备乳剂叙述正确的有
A.
水相加至含乳化剂的油相中
B.
油相加至含乳化剂的水相中
C.
若使用植物油时，初乳中油、水、胶比例为4:2:1
D.
若使用挥发油时，初乳中油、水、胶比例为3:2:1
E.
若使用液体石蜡时，初乳中油、水、胶比例为2:2:1
【单选题】The crankpins and journals were machined and matching holes bored in the webs, which were slightly ______ in diameter.
A.
smaller
B.
larger
C.
higher
D.
lower
【单选题】关于干胶法制备乳剂的叙述,正确的是
A.
干胶法又叫液中乳化剂法
B.
干胶法是先将乳化剂（胶）分散于水相中研匀后加油相制备成初乳，再稀释成全量
C.
初乳中植物油、水、胶的比例为4:2:1
D.
初乳中挥发油、水、胶的比例为3:2:1
E.
初乳中液状石蜡、水、胶的比例为2:2:1
【单选题】Even spiders that do not build webs from silk use it for a variety of purposes, such as constructing egg sacs and nursery tents.
A.
All spiders build webs.
B.
Spiders that build webs don’t build egg sacs or nursery tents.
C.
Silk is used by all spiders.
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