主页
学科
搜索
账户
常见问题
当前学科:水利水电工程管理与实务
题目:
单选题
根据《水工建筑物抗冲磨防空蚀混凝土技术规范》(DL/T5207―2005),1、2级泄水建筑物流速大于()m/s的区域应进行混凝土抗空蚀强度试验与原型空化空蚀监测设计。
A
15
B
20
C
25
D
30
答案:
<查看本题扣1积分>
查看答案
答案不对?请尝试站内搜索
推荐知识点:
患者,男,全身面积烧伤55%,近日来常寒战、高热,呈间歇热,四肢厥冷,发绀,尿量明显减少。很快血压下降到70/50mmHg。其原因最大可能是()
Write down the numbers of the topic sentences in the following passages.①People who talk and sing to plants have no mental problems at all, according to an agricultural expert. ②“In fact, singing and talking to plants makes them grow better,” says Dr Braymar. ③The reason is quite simple. ④When we sing or talk to plants, we exhale(呼出) CO2 which plants need to survive (continue to live)and grow better. ⑤Plants absorb (take in) CO2 through their pores(小孔) during the sunlight hours and produce oxygen which people to survive. ⑥Singing and talking have good effect on plants, however, only during the daytime. ⑦Singing or talking at bedtime will not help plants to grow better or grow faster.
赵某,女。45岁,患者头痛二周,加重三天,疼痛呈持续性,以前额及两颞部疼痛为主。眠差,舌淡红,苔薄白。头痛中属于少阳经头痛者选用的八脉交会穴是()
银联单位结算卡的卡BIN号是()
用切断机切料时,不得剪切下列()钢筋。
国民收入是一个国家在一定时期内新创造的价值的综合。
现场调查要求监测者亲身前往服务现场,具体到卷烟企业与零售客户之间的现场有零售客户终端现场、()和网络订货现场。
下述关于特殊人群核保规则的描述,正确的是()。
某箱形截面简支梁,跨度60m,梁宽b0=1m,梁高h=3.6m,采用Q345B钢,在垂直荷载作用下,梁的整体稳定性系数φb可取()。
在电动机的火灾预防措施中,电动机不允许频繁启动,热态下启动次数不应超过()。