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【单选题】
下列说法错误的是()A.
直流电动机制动的方法有能耗制动、反接制动和回馈制动。
B.
直流电动机起动的方法有直接起动、电枢回路串电阻起动和降压起动。
C.
串励电动机允许空载运行。
D.
串励电动机的优点是有较大的起动转矩和过载能力。
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举一反三
【单选题】--- _____ does your father usually go to work? ---By car.
A.
How
B.
What
C.
How often
【单选题】— does your grandfather go fishing? —On Saturday. [ ]
A.
How long
B.
How often
C.
How
D.
When
【单选题】— ? —She often takes a walk after dinner. [ ]
A.
What does your mother do
B.
How does your mother relax
C.
What is your mother doing
D.
Where is your mother going
【单选题】-- does your cousin go to the gym? -- Twice a week.
A.
How long
B.
How often
C.
How soon
【单选题】--- does your sister go skateboarding? --- Every day.
A.
How long
B.
How many
C.
How much
D.
How often
【单选题】—________does your father paly tennis after work? —Every Tuesday and Thursday.
A.
How often
B.
How soon
C.
How long
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