The electric furnace is used extensively to produce the high-grade steel _____ for the manufacture of steel alloys.
A: to be required
B: requiring
C: required
D: that required
A: to be required
B: requiring
C: required
D: that required
举一反三
- The research scientists often meet with problems_____new types of instrument for their solution. A: requiring B: required C: to require D: being required
- When they entered the area, the visitors ____ to turn off their smartphones. A: are requiring B: were being required C: were required D: requires
- In HTML5, which attribute is used to specify that the input field is required ( ) A: required B: formvalidate C: validate D: placeholder
- What are the disadvantages of ramp development method?( ) A: Large amount of development work B: Trackless equipment has large initial investment, heavy maintenance workload and high technical level requirements C: The development depth is restricted by driving technology and economic factors D: No steel is required
- Competely annealing is mainly used for ( ). A: hypoeutectoid steel B: eutectoid steel C: hypereutectoid steel D: all steel