为了使塑性铰区具有良好的塑性转动能力,同时为了防止混凝土压溃前受压钢筋过早压屈,在梁的两端设置()
参考答案:箍筋加密区
影响企业技术创新领域选择的产业因素是()
A、竞争对手的态势
B、外部技术供给
C、用户的需求
D、进入壁垒
He__________ he would be able to leave tomorrow, but it's beginning to take difficult.
A.hopes
B.was hoping
C.had hoped
D.hoped