对于轨道板预裂缝处裂缝、支承层裂缝、桥梁地段底座板(含后浇带)混凝土裂缝、轨道板间连接部位离缝等伤损,严禁在()进行注浆修补作业。
A.春季
B.夏季
C.秋季
D.冬季
参考答案:D
All of the following are examples of tools often used in estimate costs EXCEPT ().
A.parametric modeling
B.analogous estimating
C.bottom-up estimating
D.activity duration estimates
胎儿无脑畸形常伴随的异常是()
A.脊椎裂
B.脑积水
C.前脑无裂畸形
D.脑膜膨出
E.脊柱侧弯