冬季混凝土养护可根据具体情况,选用 、 、 、 等方法

A、如何确定混凝土最短的养护龄期

B、如何保证混凝土的入模温度

C、如何防止混凝土早期冻害

D、如何保证混凝土后期强度和耐久性满足要求

混凝土冬季施工措施有()

A.蓄热法

B.外加剂法

C.暖棚法

D.加热养护法

E.蓄热时，优先加热骨料

A.蓄热法

B.外加剂法

C.暖棚法

D.加热养护法

E.蓄热时，优先加热骨料

Read the paragraph from the section "What To Do If You Come Into Contact With A Venomous Caterpillar." Instead, grab a stick. Remove the caterpillar with it. Be careful when you do so. What information can the reader get by reading this paragraph?

A．how to safely get the caterpillar off

B．why touching caterpillars can hurt

C．how many caterpillars are poisonous

D．what different caterpillars look like

How will informtion get from the observtory to the minlnd Geologists will bring it bHow will informtion get from the observtory to the minlnd Geologists will bring it bck. B．It will be sent bck by cble. C．It will be sent by mil. D．It will be sent bck through seismometers（）

A．Geologists will bring it back．

B．It will be sent back by cable

C．It will be sent by mail．

D．It will be sent back through seismometers

One of the missions of the Orbiting Crbon Observtory isto observe the formtion of CO2One of the missions of the Orbiting Crbon Observtory isto observe the formtion of CO2. B．to collect CO2 smples from spce. C．to do CO2 experiments in spce. D．to locte the key plces of CO2 emission.

A．to observe the formation of CO2．

B．to collect CO2 samples from space

C．to do CO2 experiments in space

D．to locate the key places of CO2 emission．