计算2cos60°+tan245°=______.
原式=2×12+12=1+1=2.
______ giving up, he went on with his research,got his PhD and married the girl.
A.Without
B.Except
C.Instead of
D.But for
某些酵母菌上下两细胞连接处呈细腰状,通常称为:()
A.有隔菌丝;
B.无隔菌丝;
C.假菌丝;
D.异核菌丝