智慧职教: What ___ used as chief building materials today  __ steel and concrete.

If the carbon content of a type of steel is 0.1%， this steel is a kind of （ ）. A: low-carbon steel B: medium-carbon steel C: high-carbon steel D: HTLA steel

The steel drum was invented in Trinidad and Tobago in the 1 , and today it’s popular all over the world. It’s hard to believe, but this drum, with its sweet sound, is made from an 2 . On Trinidad and Tobago, you can hear steel drum music on the 3 , in the marketplaces, and especially during the islands’ 4 .

If the carbon content of a type of steel is 0.1%, this steel is a kind of (). A: low-carbon steel B: medium-carbon steel C: high-carbon steel D: HTLA steel E: 2-1-1 F: 章测

What____used as chief building materials today____steel and concrete. A: have been . . . are B: is . . . are C: are . . . are D: are . . . is

Steel structure is the engineering structures made of shaped steel and steel plate.

Competely annealing is mainly used for ( ). A: hypoeutectoid steel B: eutectoid steel C: hypereutectoid steel D: all steel

______is the engineering structures made of shaped steel and steel plate.

Which is more brittle, glass or steel? A: glass B: steel

Which of the following were major industries in Britain mentioned in today's reading? Choose ALL that apply.（5.0分） A: cotton B: computers C: steel D: coal E: lumber F: iron G: natural gas