船舶浮力在数值上等于（）
A.排水量也水密度的乘积
B.排水量与系数g的乘积
C.入水体积与水密度的乘积
D.入水体积与系数g的乘积
参考答案：B
—Your watch is so nice.
—Thanks! My father _______ it for me as a birthday present.
A. has bought
B. has been bought
C. will buy
D. was bought
M8的4T法兰螺栓，其装配扭矩是（）。
