按照信息的层次划分,可将建设工程信息分为( )。
Sometimes buyers only purchase some , tangible or intangible.
Goods are carried by several of transport--on road or rail, by sea or air.
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
10.水利工程施工管理一般应是:()。
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