国标规定的齿轮画法是齿根圆可省略。( )
参考答案:对
Beer is the most popular drink among male drinkers, whose overall consumption is ______ higher than that of women.
A.virtually
B.significantly
C.inevitably
D.proportionally
阳极材料应具备的条件,不包括
A.熔点高
B.原子序数高
C.热传导率高
D.易被X线穿透
E.金属蒸发率低