A.These teeth would work harder and become healthier.
B.Decay of teeth could not develop.
C.We would eat the diet of our ancestors.
D.Teeth can be extracted easily during childhood.
第1题
塔式起重机驾驶员严禁用自由下降的方法下降吊钩或重物,当重物下降距就位点约()m时,必须采用慢速就位
A.1
B.2
C.3
D.4
第4题
严禁采用自由下降的方法下降吊钩或重物。当重物下降距就位点约()m处时,必须采用慢速就位。
A.1
B.3
C.4
D.5
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