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搜题
【单选题】
激光防龋的主要功能不包括下列哪项()
A.
促使釉质形成抗酸性强的玻璃样物质
B.
减少脱钙量
C.
抑制变形链球菌的生长
D.
通过解吸附作用使菌斑脱落
E.
与氟化物结合,可促进牙本质钙化
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皮皮学刷刷变学霸
举一反三
【单选题】材料的塑性指标有______。
A.
σ s 和σ b
B.
σ b 和δ    
C.
δ和ψ    
D.
以上都不是
【判断题】某宗房地产成交总价为30万元,其中首付款20%,余款于一年后一次性支付。假设月利率为0.5%,则该宗房地产在其成交日期一次性付清的价格为28.61万元。( )
A.
正确
B.
错误
【单选题】与Q235号钢相比,Q255号钢( )。
A.
δ大,σS小
B.
δ大,σS大
C.
δ小,σS小
D.
δ小,σS大
【单选题】The competitions that we have discussed in this chapter do NOT include ______.
A.
“21 Century Cup” National English Speaking Competition
B.
National English Competition for College Students
C.
'FLTRP Cup' English Public Speaking Contest
D.
“Star of Outlook” English Talent Competition
【单选题】to the conference, we have already discussed this problem among ourselves.
A.
Similar
B.
Previous
C.
Cautious
D.
Senior
【单选题】If we had discussed it with the manager, he would have surely agreed with it.
A.
unnecessarily
B.
simply
C.
certainly
D.
possibly
【简答题】σb δ
【单选题】单相桥式整流电路的输出电压的波形是()
A.
正弦波
B.
“M”型脉动直流
C.
幅度平稳的直流
D.
矩形信号
【单选题】水力发电站的建成主要是依靠()能量的转换。
A.
核能
B.
风能
C.
势能
D.
电能
【单选题】________ teaching method, we have not yet discussed it.
A.
In relation to
B.
In contrast to
C.
In addition to
D.
In regard to
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