建筑施工安全“三宝”是什么？
参考答案：
安全帽、安全带和安全网。
母牛发情主要集中在（）。
A、上午
B、下午
C、前半夜
D、后半夜
Which of the following statements concerning cargo is correct?（）
A.Cargoes are any type of goods transported by any type of ships
B.Cargoes are goods transported in bulk
C.Cargoes usually include goods transported in bulk and in containers
D.Cargoes are usually packaged in containers
