China’s foreign ministry has called on Canada to be “non-discriminatory” towards Huawei Technologies Co. and other mainland firms after a survey found more than three-quarters of Canadians want the tech giant banned from the country’s 5G networks. The Nanos poll was conducted for The Globe and Mail newspaper after China released two Canadians whose detention for almost three years was viewed by Ottawa as hostage diplomacy. Michael Kovrig and Michael Spavor were released last month on the same day as Huawei executive Meng Wanzhou, who was being held under partial house arrest in Vancouver until she struck a deal with...