单项选择题
The difference in water spray pattern between the high-velocity tip and low-velocity applicator used with the all-purpose nozzle is due to（）.
A.a difference in water pressure B.the method of breaking up the water stream C.the length of the applicator D.All of the above
单项选择题 The dew point is reached when the（）.
单项选择题 The design specifications for cranes and crane foundations on ship’s are set and published by the（）.
单项选择题 The depth（）a shallow patch，lying about 1.3 miles southeastward of Nanshan Tou lighthouse reduces to about 6.1 meters.
