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【多选题】
对试验结构构件进行承载力试验时,在加载或持载过程中出现下列标志之一()即认为该结构构件达到或超过承载能力极限状态。
A.
对有明显物理的热轧钢筋,其受拉主钢筋应力到达屈服强度,受拉应变达到0.01;对无明显物理的钢筋,其受拉主钢筋的受拉应变达到0.01。
B.
受拉主钢筋拉断。
C.
受拉主钢筋处最大垂直裂缝宽度达到1.5MM。
D.
挠度达到跨度的1/50;对悬臂结构,挠度达到悬臂长的1/25;
E.
受压区混凝土压坏。
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参考答案:
举一反三
【单选题】二尖瓣关闭不全患者最常见的症状和体征是
A.
劳力性呼吸困难
B.
意识错乱
C.
肌酸磷酸激酶浓度增加
D.
胸痛
E.
咯血
【单选题】从水中萃取水溶性生物碱所采用的溶剂是
A.
乙醇    
B.
乙醚    
C.
三氯甲烷  
D.
正丁醇    
E.
【单选题】女性,23岁,既往无心脏病史,流产后一周,出现急性细菌性心内膜炎,伴二尖瓣关闭不全的症状及体征,血培养有粪链球菌生长,最适宜的治疗为
A.
行二尖瓣置换术后用抗生素6周
B.
静滴氨苄青霉素,每日12g,用4周
C.
静滴青霉素G2400万U/d,持续6周
D.
静点氨苄青霉素,每天12g,庆大霉素3mg/(kg•d),持续4周
E.
静点万古霉素,每天1g,持续4周,链霉素每天1g,用2周
【单选题】What is the purpose of a network mask?()
A.
It is used in conjunction with the wildcard mask to determine the number of hosts on a network
B.
It is used to define which parts of the IP address are allocated to host addresses and network prefixes
C.
It is used to hide subnets from external networks by masking the subnets with NAT
D.
It is used to differentiate a network as a classful network or a classless network
【简答题】Unknown to most Facebook users, the social network actually offers a lot of privacy controls and security features which can help you lock your account, so you can speak freely. If it’s used properly,...
【简答题】二尖瓣关闭不全的症状和体征 ?
【判断题】太阳光谱主要由发射线谱构成
A.
正确
B.
错误
【单选题】What is the purpose of a network mask?()
A.
It is used to identify the maximum hop count of a subnetwork
B.
It is used to identify an IP address as either private or public
C.
It is used to identify the network to which an IP address belongs
D.
It is used to identify the total number of bits present in an IP address
【单选题】In a type of computer network, what does MAN stands for?
A.
Major area network
B.
Mini area network
C.
Metropolitan area network
D.
None
【单选题】What is the goal of QoS in a network? ()
A.
prevent packets from being dropped
B.
increase available bandwidth
C.
reduce hardware errors
D.
provide predictable network service
E.
eliminate propagation delay
F.
eliminate jitter and packet loss
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