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【单选题】
下列对金属烤瓷用合金与瓷粉的描述哪项是错误的A.
瓷粉熔点高于合金熔点
B.
瓷的膨胀系数小于烤瓷合金
C.
合金与瓷粉应有良好的生物相容性
D.
合金与瓷粉应个含有一种或一种以上相同元素
E.
以上均是
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反馈参考答案：
举一反三
【单选题】The naughty boy_his pockets_little stones.
A.
filled；in
B.
filled；with
C.
full；with
D.
full；of
【简答题】在○和□里填上相应的运算符号和数． （75×25）×4=75×（□×4） （14+15）a=14×□+□×a 235-54-46=□○（□○□） 1200÷25÷4=□○（□○□）
【单选题】The naughty boy ___ in his shoes when he saw the cane in his father's hand.
A.
quiver
B.
tremble
C.
shake
D.
shiver
【单选题】The naughty boy（）in his shoes when he saw the cane in his father's hand.
A.
shivered
B.
trembled
C.
frightened
D.
feared
【单选题】The naughty boy pretended when his mother came into the room.
A.
to sleep
B.
sleeping
C.
to be sleeping
D.
to have slept
【单选题】The naughty boy sat restlessly on the chair with his two legs
A.
swerving
B.
swaying
C.
swinging
D.
skidding
【简答题】递等式计算，能简算的要简算． ①254×99 ②13.6-（2.6+0.25÷25%） ③1200÷〔56×（ 3 7 - 3 8 ）〕 ④（ 6 13 ×1.7+ 7 13 ×1.7）÷ 7 10 ⑤1375+450÷15×25．
【简答题】直接写出得数。 800+700= 42÷7= 46-21= ÷8= 35-26= 36÷6= 21÷7= 30+1200= 370-70= 54÷9= 18÷9= 60+60= 25+36= 81÷9= 25÷5= 180-90= 4800-4000= 16÷4= 28+28= 72÷8= 3×9+27= 56-7×8= 66-（25+35）=
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