Drill a hole at the intersection of the two lines.

单选题

Drill a hole at the intersection of the two lines.

答案解析

问答题

Drill a stop hole with a diameter between 1 and 3 mm in the sheet of steel affected by the crack to stop the crack.

答案解析

单选题

Every crew member shall participate in at least one abandon ship drill and one fire drill ___. The drills of the crew shall take place within ___hrs of the ship leaving a port if more than 25% of the crew have not participated in abandon ship and fire drills on board that particular ship in the previous month.A. every week, 24 B. every month, 24 C. every week, 48 D. every month,48

答案解析

单选题

Ream the hole 0.20 inch larger than tie standard.

答案解析

材料题

possible to locate.A black hole in the universe is not a solid object, like a planet, but it is shaped like a sphere（球体）. Astronomers（天文学家）think that at the center of a black hole there is a single point in space with infinite（无限的）density（稠密）.This single point is called a singularity（奇点）.If the singularity theory is correct,it means that when a massive star collapses,all the material in it disappears into the singularity.The center of a black hole would not really be a hole at all,but an infinit

答案解析