Preventer bars are fitted on lifeboat releasing hooks to prevent().
A. the falls from unhooking if the releasing gear is operated accidentally while the boat is being lowered
B. operation of the release lever until the boat is waterborne
C. the falls from rehooking after they have been released
D. accidental unhooking when the falls become slack
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《木偶奇遇记》中皮诺曹和爸爸是在大鲨鱼的肚子里相见。
A. 正确
B. 错误
(1).易吸湿的药品() (2).易挥发的药品()(3).易受光线影响而变质的药品()(4).怕热的药品()
实行“B区域”的国家有美洲和亚洲的日本、中国、菲律宾等。
A. 正确
B. 错误
当上层土质松软,而在不深处有较好的土层时,为了节约基础材料和减少开挖土量可采用()基础。
A. 柱下单独基础
B. 墙下单独基础
C. 柱下钢筋混凝土条形基础
D. 墙下条形基础