工程建设定额具有( )等特性。
A.复杂性
B.权威性
C.公开性
D.公证性
参考答案:B
股骨头骨软骨病多见于年轻人,多发双侧,髋部疼痛跛行。()
The number of people invited ____ fifty, but a number of them ____ absent for different reasons.
A.were , was
B.was , was
C.was , were
D.were , were