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least not until wartime when wheat prices threatened to run wild.Anxious to check inflation and rising life costs, the federal8. __________

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governmentappointed a board of grain supervisors to deal with deliveriesfrom the crops of 1917 and 1918. Grain Exchange trading was suspended,and farmers sold at prices fixed by the board. To handle with the 9. __________

crop of 1919, the government appointed the first Canadian WheatBoard, with total authority to buy, sell and set prices.10. _________

慢性龈炎的诊断依据不包括

A. 龈缘附近牙面有明显的菌斑、牙石堆积
B. 可探及龈下结石
C. 龈沟加深或龈袋形成
D. 龈沟探诊出血
E. 游离龈及龈乳头发红,龈缘变厚

龈上洁治术中下列哪项不必做

A. 改良握笔法握持器械
B. 放稳支点
C. 仔细探查牙石位置
D. 刀刃与牙面成80度角左右
E. 以腕部发力刮除牙石