【简答题】Define
and describe the Cartesian coordinate system.
【多选题】关于预应力混凝土工程施工,说法正确的是( )。
A.
钢绞线作预应力钢筋,其混凝土强度等级不宜低于C40
B.
预应力混凝土构件的施工中,不能掺用氯盐早强剂
【简答题】Define engineering geometry and describe its importance to engineering design.
【简答题】Define and describe the uses for technical sketching.
【简答题】define protozoa and describe their general characteristics.