PLC提高硬件可靠性的措施有()
A.硬件冗余配置
B.对干扰屏蔽
C.电源的调整和保护
D.以上全是
参考答案:D
— Have you been wasting time on cartoons again?
— __________. I’ve been working all the time and I need a break.
A.Not really
B.No way
C.That’s all right
D.I couldn’t agree more
皮肤炭疽的临床特征为()
A.发热、不适
B.局部淋巴结肿大
C.感染处中心出血坏死,周围有水疱围绕
D.血性分泌物在溃疡表面形成数厘米的黑色结痂
E.溃疡周围组织水肿,但不痛,不化脓