三相异步电动机的调速方法中，属于有级调速的是（ ）
A. 调压调速
B. 改变磁极对数调速
C. 转子电路串电阻调速
D. 变频调速
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Which one is not the reason for London's Chinatown is a living museum?
A. It keeps the food.
B. It keeps the tradition.
C. It keeps transforming.
D. It has historic buildings.
Whichstatement is not correct about the Durian?
A. Laner can not resist the temptation totastes it.
B. Laner asked theaudience thatwhetherthey know the name ofit.
C. Lanersaid that people may love or hate it.
D. They introduced it in the "New Loon Moon Supermarket."
Whichstatement is not correct about the cake that looks like the shape of fish?
A. Basically it isoriginated from Japan.
B. They arrived at the Chinatown Bakery to introduce the cake.
C. It is a dietin Chinatown of New York.
D. It is not sweet but delicious.
What is the part of speech of the underlined word in the following sentence?"He eliminated hisrivalsin a brutal struggle for power."
A. Verb.
B. Noun.
C. Adj.
D. Adv.
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