填空36.某容器顶部压力和底部压力分别为-60Kpa和300Kpa,若当地大气压力为标准大气压,则容器顶部和底部的差压为____。
填空28.气动仪表以________为能源。
多选40.化工自动化仪表按其功能不同，分为（ ）。
— Is it better to be physically attractive or intelligent?
— .
— Do you prefer a portable or a clumsy 3D printer?
— .
Sometimes buyers only purchase some , tangible or intangible.
You can have eggs or hard-boiled.
Goods are carried by several of transport--on road or rail, by sea or air.
Every child is unique. Don’t him or her to others.
Prices may change quickly if supply or demand .
— I wonder whether I could accept this discount or not.
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