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【多选题】
关于三相电源的接线方式,下面说法正确的包括()A.
三相电源的末端连接到同一个点，首端连接负载，可构成星形接线。
B.
三相电源的中性点是指三相电源末端的连接点。
C.
角接三相电源也存在中性点。
D.
角接三相电源如果某相电源接线接反，会在角接三相电源内部产生较大环流。
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举一反三
【单选题】Why did the little girl put her gloves into her boots? 查看材料
A.
She worried to lose them．
B.
To make her teacher find them．
C.
She didn't know the reason．
D.
She didn' t like them．
【单选题】It is easy to see why many little girls prefer to ______ with the male role, but the girl who does find the male role more attractive is faced with a dilemma.
A.
beautify
B.
modify
C.
identify
D.
justify
【单选题】There is no doubt________Ma Lili is a gifted girl. [ ]
A.
whether
B.
that
C.
what
D.
why
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