2、在梯形图中表示串联单个常开触点的是（ ）指令A. A B.AN C.AC D.AD A: A. A B: B.AN C: C.AC D: D.AD

3、在梯形图中表示联单个常闭触点的是（ ）指令A.A B.AN C.O D.ON A: A.A B: B.AN C: C.O D: D.ON

（)它提供BTS和BSC之间的接口。 A: A.TRE B: B.AN C: C.SUM D: D.ANY

An increase in load on a diesel engine results in _____ of speed of the crankshaft. A.a reduction B.an increase C.an outing D.a downwards

中国大学MOOC: 2、在梯形图中表示串联单个常开触点的是（ ）指令A. A B.AN C.AC D.AD

中国大学MOOC: 3、在梯形图中表示联单个常闭触点的是（ ）指令A.A B.AN C.O D.ON

A statement of opinion may be which of the following？（) A: A.a type of guarantee B: B.an affirmation of the value of the goods C: C.an implied assurance not expressly stated D: D.an explicit description of the goods

Which of the following details about Ellen is CORRECT What does Ellen expect to get from Mr. Ronald A: A favorable recommendation letter. B: B．An opportunity of a job interview. C: A volunteer position at the charity. D: D．Some money to cover her tuition.

Whichtwowordsareclosestinmeaning?<br/><b>cycle</b><b>，</b><b>hawk</b><b>，</b><b>convey</b><b>，</b><b>extort</b><b>，</b><b>peddle</b><b>，</b><b>summon</b>

设A{a,b}，则P(A)×A = (   )。 A: A B: P（A） C: {<Φ,a>,<Φ,b>,<{a},a>,<{a},b>,<{b},a>,<{b},b>,<A,a>,<A,b>} D: {<a,,Φ,>,<b,,Φ,>,<a,{a}>,<b,{a}>,<a,{b}>,<b,{b}>,<a,A>,<b,A>}