管路安装标准化操作中，砸伤的防范措施有（） ["严禁带压操作","选择与管阀配件合适的工具进行操作","工件拿稳、摆放平稳","搬运工用具、配件时严禁抛扔"]
How does the effect known as bank suction act on a single-screw vessel proceeding along a narrow channel?（）. ["It pulls the bow toward the bank","It pushes the entire vessel away from the bank","It pulls the stern toward the bank","It heels the vessel toward the bank"]
中国出口商品会（广交会）每年在广州举办（）。 ["一次","两次","三次","四次"]
“人类的一切痛苦都是创业的机会”说明了（）。 ["人类创业很痛苦","痛苦与创业直接相关","寻找创业点的关键","创业的重要性"]
某基因片段中碱基摩尔数之比为A：C：G：T=2：3：3：2，则以该基因片段的一条链为模板转录而成的mRNA中嘌呤碱基与嘧啶碱基的摩尔数之比为（） ["1：1","2：3","3：2","不确定"]
“按客户订单组织货源”工作的主要内容（四大业务模块）是什么？
