The FIRST thing to do to ensure that a refrigeration unit will not start while undergoing repairs, is to _____.

A．secure and tag the electrical circuit

B．place a crow bar in the flywheel of the unit

C．inform. all persons in the area not to start the unit

D．make a log book entry

[单选题]In order to ______ the disease, the first thing we should do is to do resea

[单选题]The first thing George did at the training school was ______.A． to take an experienced pilot in a planeB． to be taken up into the air in a plane by an officerC． to fly a commercial planeD． to talk about his ideas

[单选题]A．fter the earthquake, the first thing the local government did was to provide _____ for the homeless families.A． accommodationB． occupationC． equipmentD． furniture.

[单选题]What can you do to[ensure] that you will stay healthy?A.be assuredB.insistC

[单选题]---What should I do first before boarding? ----().A．You may ask the policeman there to help.B．Please go to the airline counter to check-in for your flight.C．You should wait and see.D．You have to go there to check in for your flight.

[试题]InthisageofInternetchat,videogamesandrealitytelevision,thereisnoshortageofmindlessactivitiestokeepachildoccupied.Yet,despitethecompetition,my8-year-olddaughterRebeccawantstospendherleisuretimewritingshortstories.Shewantstoenteroneofherstoriesintoawrit

[单选题]You __________ all those calculations! We have a computer to do that sort o

[单选题]He said he had every( )in his secretary； she would do the right thing.A.wor

[单选题]Do you still remember the place ______ we first met five years ago?A.whereB

[单选题]When do people decide whether or not they want to become friends? During th