【多选题】色调按色彩的纯度来分,可以分为()、()、()
【判断题】一种加工方法的加工精度达到一定的程度后,只要再增加加工成本,加工精度还可以提高。
【单选题】检测细菌能否产生H 2 S时,应选择的培养基是
【单选题】A sole proprietorship:
A.
is a business owned and operated by one individual
B.
is a business form that protects the personal assets of the owner
C.
is a business form that requires several formalities
D.
is a business form that pays taxes as a business
【多选题】机工是指由工人操纵机床对工件进行加工,下列选项属于机工常用的加工方法的是( )。