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【简答题】
若家计数器的计数输入电路CU由断开遍未接通,复位输入电路R______,计数器的当前值加1.当前值大于等于预设值PV时,梯形图中其常开触点______,常闭触点______。复位输入电路______时,计数器被复位,复位后梯形图中其常开触点______,常闭触点______,当前值为______。
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举一反三
【单选题】—What’s a quarter and a half, do you know? —Yes, it’s __________.
A.
two-sixths
B.
three quarters
C.
three-fourth
D.
three-sixths
【单选题】It's over ______ from Shijiazhuang to Beijing. [ ]
A.
three hours' drive
B.
three hour's drive
C.
three hour drive
【单选题】-- What's one-fourth and a half, do you know?-- Yes, it's ______.
A.
three-fourths
B.
three-fourth
C.
three fours
【单选题】What time is it now?
A.
It's three fifty.
B.
It's three fifty-five.
C.
It's four fifteen.
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