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【判断题】
奥氏体不锈钢与珠光体耐热钢焊后在焊接接头中即会形成明显的扩散层。A.
正确
B.
错误
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举一反三
【简答题】At that time food was scarce and of poor q______( 质量 ).
【单选题】下表为某同学做的灯电流的选择实验数据,则此空心阴极灯的灯电流应选择()。
A.
流/mA1.32.03.04.05.06.0
B.
.30.60.50.50.60.6 5.0Ma
C.
4.0mA
D.
1.3mA
E.
2.0mA
【单选题】What is the limitation of the rubidium method?
A.
Rubidium is everywhere in the rock.
B.
Strontium atoms are hard to detect at the normal temperature.
C.
It cannot date sediments.
D.
It is time-consuming.
【简答题】［A］ scarce ［B］ little ［C］ rare ［D］ poor
【单选题】Water is considered a scarce good because:
A.
. scarce goods are less expensive.
B.
. not enough of it is available for all needs.
C.
. not enough of it is available for all needs and because it is less expensive.
D.
. it does not have any uses.
【单选题】It is of vital importance that a person ______ at least both physically and mentally strong to be an astronaut(宇航员).
A.
shall be
B.
be
C.
are to be
D.
must be
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