He drills the choir to a high standard.他将合唱团训练到了一个高水平。We replaced hand picks with pneumatic picks and electric drills.我们把手镐换成风镐和电钻.Much of their study and revision was done to the thud of hammers and pneumatic drills...他...
Sow the seeds in drills about 1/2in. deep and 12in. apart.在深约0.5英寸，间隔12英寸的条播沟里播种。The racket of drills and electric saws went on past midnight.钻孔机和电锯的噪声过了半夜还继续响着。We replaced hand picks with pneumatic picks and electric dr...
它还具有优良的耐点蚀和应力腐蚀开裂.It also has an excellent resistance to pitting and to stress - corrosion cracking.LF21M除点蚀 、 缝隙腐蚀外还发生层间腐蚀.Pitting, crevice corrosion and layer corrosion occurred on 180 YS and LF 21 M.该合金的剥蚀是从点蚀发展到晶间腐蚀,...